The correct option is A Hydrogen
The
Sun is a big ball of gas and plasma. The main gases are hydrogen or helium, but
there are also small amounts of other elements such as oxygen, carbon,
nitrogen, magnesium and iron. Sun is composed of 75 % of hydrogen and 26.5 % of
Helium. Hydrogen is the main constituent of the Sun's core. Hydrogen is
converted into the energy in core of the sun. This energy moves towards the sun’s
atmosphere through interior layers. Then, it is released in the solar system as
heat and light.